Roller-mill



(No Modl.) 1 2 Sheets-Sheet 1.

N. W. HOLT.

ROLLER MILL.

Patented Feb. 26. 1884'.

(No Model.) 2 Sheets- Sheet 2.

' y N. W. HOLT. Y

ROLLERMILL. 10.294.235 Patenwdeb. 26, 1884.

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N, PETERS. Pimm-Langman WMI-...genna Nirn *FATFS ArnNr Finca..`

NOAH w. HOLr, OF BUFFALO, NEW YORK.

ROLLER-NULL.

SPECIFICATION forming part of Letters Patent No. 294,236, dated February26, 1884.

.Application filed September' l1, 1883. (No model.)

To all whom it may concern.:

of New York, have invented new and usefulv Improvements in Roller-Mills,of which the following is a specification.

This invention relates to an improvement in that class of roller-millswhich are employed for the reduction of grain in the manufacture offlour and similar products.

My invention has the obj eet to provide means for keeping the rollersclean and cool, and for carrying off the iloating dust from therollermill casing.

My invention consists, to these ends, of the improvements which will behereinafter fully set forth, and pointed ont Vin-the claims.

In the accompanying drawings, consisting of two sheets, Figure 1represents a vertical section of a roller-mill provided with myimprovements. Fig. 2 represents a horizontal section in line x az,Fig. 1. Fig. 3 is a crosssection of one of the air-pipes on an enlargedscale. Fig. @represents a partly sectional top plan view of the machine,the section being taken in line y y, Fig. 1.

Like letters of reference refer to like parts in the several figures.

A A represent two pairs of grinding or reducing rollers arranged inthe'same casing, B, in a well-known manner.

B B represent the two feed-hoppers, arranged, respectively, over the twopairs yof grinding-rollers. l

C C represent the feed-rollers, and D D the feed-slides, all of ordinaryand well-known construction. 4

E represents an airchamber arranged between the side walls of theroller-casing above and between the inner rollers, A', below thefeed-hoppers, and between the feed-rollers.

e represents the outer walls of the'airchamber E, extending upwardlyfrom the inner rollers, A, and provided on the rearside .of eachfeed-roller C with an air passage or opening, f, which is provided withan adjustable gate or valve, F.

g represents the inner inclined walls of the feed-hoppervs, extendingupwardly from the upper sides of the feed-rollers to a centralpartition, g. The openings f are arranged near the lower ends oftheinclined walls g, and in rear of the latter. The gates F are arranged inthe air-chamber E, and Vpivoted in the side walls of the rollenoasing,and provided on the outside of the casing with handles 7L, by which theycan be adjusted.

I represents an air spout or pipe communicating with the chamber E, andforming an exit-passage through which the air escapes from the chamberE. lo. represents the bottom plate of the chamber E, located between theinner rollers, A, and provided with an opening or air-passage, k.

K represents an adjustable gate or valve arranged above the opening 7c',to regulate the flow of air through the same.

M M2 represent air-passages'arranged, respectively, against the outersides of the rollers A A', runninglengthwise of the same, and M are airpassages or tubes, whereby each passage M is connected with the passageM2, so that the air will pass from the passage M through the passage Minto the passage M2. The passages M M2 are constructed in the forni oftroughs or tubes having a longitudinal opening on one side, the opensides of the troughs or tubes nesting against the rollers, as clearlyshown in Figs. 1 and 3. The edges of the troughs may be provided withpacking-strips m of leather or other iiexible material, resting againstthe rollers, as shown in Fig. 3. The passages M are fitted against theouter rollers, A, and the passages M2 against the inner rollers, A.Those portions of these passages which extend beyond the rollers as wellas the passages M are constructed` in the form of tight tubes. Thepassages M2 are arranged in the air-chamber E, and their endsfarthestremoved from the pipes M are provided with apertures a, whichopen into said air-chamber.

O represents a blast-fan having its blastf spouto connected with theair-passages M M in such manner th at air-currents are driven by saidfan through the air-passages M M M2 into the chamber E in the directionof the arrows in Fig. 2. The air-currents owing through 'the passages MM2 pass along the surfaces of the rollers A A, and remove therefrom thedust and light fuzzy material adhering to the same, and at the same timekeep the rollers cool. The action of the air-currents is confined IOO tothe portions of the roller-surfaces which are l covered by theair-passages, and the air-currents do not in any way interfere with oraffect the grinding action of the rolls or the passage of the materialto and from the rolls.

P represents a suction-fan, having its eye connected with the air-trunkI, so as to exhaust the air from the chamber E. The exhaustion of thechamber E causes air-currents to enter the chamber E from the interiorof the casing B through the openings f and k. The aircurrents enteringthrough the openings f pass through the streams of grain escaping fromthe feed-rollers and past the rear sides of the feed-rollers, and removethe dust contained in the grain or adhering to the feed-rollers. By thismeans the dust removed from the feedroller is not again brought incontact with the material escaping from the feed-roller. The lowerportion of the casing B has openings admitting'the external air in theusual manner. A portion of the air entering the casing B passes throughthe opening k into the chamber E, and carries with it any dust or lightparticles iioating in the casing B below the rollers A A. The exhaustionof the chamber E will also cause air-currents through the passages M M/M2 in the proper direction in the absence of a blast-fan, O, and thelatter may be dispensed with, if desired. The blastspout p of the fan Pdischarges the dust-laden air into a suitable dust-room ordust-collector.

Vhen a number of roll er-mills are employed, a single fan may beconnected with all of the roller-mills by suitable branch spouts.

Y The mechanism for cooling and cleaning the rollers may bey 'usedindependently of the mechanism for cleaning the feed-rollers, andinstead of connecting the two air-passages of each pair of rollers, sothat the air-current passes successively along both rollers, eachairconduit may be directly connected with the fan or other devicewhereby the air-current is created; but I prefer the construction shownand described, as being very simple, compact, and effective. Y

l am aware that rollers have been provided with air-pipes wherebyair-currents are directed against the surface of the rollers, and this Ido not claim.

I claim as my inventionl. The combination, with a revolving roller, ofan air passage or conduit fitted with its open side lengthwise againstthe roller, and niechanism whereby an air-currentis caused to low pthrough said conduit or passage along the portion of the roller-facewhich is covered by said conduit or passage, substantially as set forth.

2. The combination, with t-wo revolving rollers, of air passages orconduits fitted with their open sides lengthwise against the rollers, aconduit whereby said passages are connected, and mechanism whereby anair-current is caused to `fiow successively along both rollers throughboth of said conduits or passages, substantially as set forth.

3. The combination, with rollers A A, of air-conduits arranged along therollers, a chamber, E, into which vthe several air-conduits open, and anexit-spout, I, through which the air is discharged from the chamber E,substantially as set forth.

4t.. The combination, with the reducing rollers A A', feed-rollers C,and inclosingcasing B, of an air-chamber, E, having openings f and 7c',substantially as set forth.

'5. The combination, with the reducingrollers A A, feed-rollers C, andinclosingcasing B, of an air-chamber, E, having opeir A ings f, andair-conduits M, opening into the chamber E, substantially .as set forth.

Vitness my hand this 13th day of August, 1883.

NOAH XV. HOLT.

Vitnesses:

CARL F. GEYER, JNO. J. BONNER.

